mapnik/tests/visual_tests/styles/marker-recenter-collide.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Map>
<Map background-color="white" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
  <Parameters>
    <Parameter name="sizes">256,128</Parameter>
  </Parameters>

    <Style name="point">
        <Rule>
            <TextSymbolizer face-name="DejaVu Sans Book" size="16" dx="[offset]" dy="[offset]">"I"</TextSymbolizer>
            <MarkersSymbolizer file="shape://arrow"/>
            <DebugSymbolizer/>
        </Rule>
    </Style>

    <Layer name="layer" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
        <StyleName>point</StyleName>
        <Datasource>
            <Parameter name="type">csv</Parameter>
            <Parameter name="extent">-1,-0.5,1,0.5</Parameter>
            <Parameter name="inline">
                lat,lon,offset
                0,-0.35,10
                0,0.35,0
            </Parameter>
        </Datasource>
    </Layer>

</Map>